Hi Charles,

It seems the problem is about the cl2.hpp, the release v1.1.1 does not support OpenCL2.0 API. Maybe you need a -DCL_HPP_TARGET_OPENCL_VERSION=120 as a compile option.

Could you give us the backtrace to confirm that?

Thanks
Xiuli

Hi Xiuli,

I am unfortunately working through this bug via a kind user who is able to reproduce this problem.  Do you have a proposed method that you prefer to get the backtrace?  gdb? valgrind? other method?

If you have any specific instructions I can contact the user and return the output to you.

Thanks,
Charles

Hi charles,

GBD with bt(backtrace) is fine.

Thanks
Xiuli

Here are the results from the backtrace

(gdb) r
Starting program: /home/Hornik/tmp/WWW/opencl_test
 1  2  3  4
 5  6  7  8
 9 10 11 12
13 14 15 16
 1  2  3  4
 5  6  7  8
 9 10 11 12
13 14 15 16
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
got platforms
selected default platform
Context Made
Device Found

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) backtrace
#0  0x0000000000000000 in ?? ()
#1  0x0000000000404ba6 in cl::CommandQueue::CommandQueue (this=0x7fffffffdec0,
    context=..., device=..., properties=0, err=0x7fffffffe058)
    at /usr/include/CL/cl2.hpp:6833
#2  0x0000000000402dad in main () at opencl_test.cpp:96

Hi charles,

It seems to be the cl2.hpp called some api that only OpenCL 2.0 supported.
For beignet releasev1.1.1, it only support OpenCL 1.2 api. If you want to use beignet with the cl2.hpp please use -DCL_HPP_TARGET_OPENCL_VERSION=120 with -DHAVE_CL2 or just try to use cl.hpp.

In short, beignet 1.1.1 does not have those api cl2.hpp needed, use cl.hpp instead.

Thanks
Xiuli

Thanks for looking into this.  That said, is there a timeline for beignet to accept OpenCL 2.0?

(In reply to charles from comment #6)
> Thanks for looking into this.  That said, is there a timeline for beignet to
> accept OpenCL 2.0?

Could it work with OpenCL 1.2? If problem solved I'd like to close this bug.
For OpenCL 2.0 we are still working on it.

Thanks
Xiuli

It appears this didn't solve the problem.  The compiler complains about a minimum opencl version.

$ g++ opencl_test.cpp -o opencl_test -g -I/usr/include/eigen3 -lOpenCL -std=c++11 -DCL_HPP_TARGET_OPENCL_VERSION=120
In file included from opencl_test.cpp:11:0:
/usr/include/CL/cl2.hpp:407:3: error: #error "CL_HPP_MINIMUM_OPENCL_VERSION must not be greater than CL_HPP_TARGET_OPENCL_VERSION"
 # error "CL_HPP_MINIMUM_OPENCL_VERSION must not be greater than CL_HPP_TARGET_O

Hi charles,

I have tried the exact case you provide, the problem is still about the cl2.hpp. For beignet-dev from apt-get it only support OpenCL 1.2 api.
So you must pass the exact option to enable only OpenCL 1.2 api.
I have used this to build and can run (maybe need to delete the cout in line 8)
g++ test.cpp -o opencl_test -g -I/usr/include/eigen3 -lOpenCL -std=c++11 -DHAVE_CL2 -DCL_HPP_TARGET_OPENCL_VERSION=120 -DCL_HPP_MINIMUM_OPENCL_VERSION=120

Please have a try, thanks!

The result:
./opencl_test
 1  2  3  4
 5  6  7  8
 9 10 11 12
13 14 15 16
 1  2  3  4
 5  6  7  8
 9 10 11 12
13 14 15 16
got platforms
selected default platform
Context Made
Device Found
Command Queue created
Program created
Program Built
Kernel made
Buffers initialized
Buffers written
kernel completed
Completed Buffer Read
Result
 90 100 110 120
202 228 254 280
314 356 398 440
426 484 542 600


Thanks
Xiuli

Xiuli,

The additional -DCL_HPP_MINIMUM_OPENCL_VERSION flag did in fact fix the problem.  It now compiles and runs without problem.  Thanks for your help.

Regards,
Charles

OK, I will close this bug.